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TM4C1294NCPDT: Connect two CAN controllers together

Briceag Cosmin
Intellectual 840 points
Part Number: TM4C1294NCPDT

Hello,

Would be possible to connect two CAN controllers together ?

MCU0_CAN_TX->MCU1_CAN_RX

MCU1_CAN_TX->MCU0_CAN_RX 

I do not need a bus, therefore I do not need signals translation. It is just for testing.

Thank you,

  • 0
    TI__Guru*** 135355 points
    Hello Briceag,

    That would not work. You need a transceiver because the CAN module needs to see its own TX reflected back on RX through a transceiver.
  • 0 in reply to Ralph Jacobi
    Guru 117855 points

    With 'ALL' risk - fully accepted & acknowledged by (any) user - firm/I have been advised (that the above noted 'TX reflection') (may) be achieved via the insertion of a resistor between CAN_TX and CAN_RX.   (~10K seems a 'reasonable' starting point)    

    Such well qualifies as a, 'Quick and (very) Dirty' implementation.    Note that I am not  'advocating for this'  -  instead simply 'reporting the belief/findings'  - of one or more of my firm's clients.     This path chosen - only -  if/when clients were 'rushed & desperate.'      (and for 'test only' - knowledge gleaning - purposes)

    Accept too - that 'Any Real World' application 'will demand' use of CAN Transceivers (one at each end) along w/suitable termination.     Such xcvrs. are available w/both 5V & 3V3 supply inputs - the latter (3V3) should be employed for MCU's here...

  • 0 in reply to cb1_mobile
    Intellectual 840 points

    Hello,

    Thanks a lot guys.

    Your replies solved my issue (actually my doubt).

    Thank you,

  • 0 in reply to Briceag Cosmin
    Guru 117855 points

    Good that!     However - you have, 'Marked your (own) post - as the one which Resolved your issue."

    Yet - your post simply, 'Noted that another, earlier arriving post - had provided the (real) Resolution."    It is one - or both - of those earlier posts - which should (now) more correctly receive - your 'This Resolved' Green Stamping (Award)...   You 'can' make such award to multiple posts - especially those which (really) Resolved your Issue/Doubt...

    BTW - great landscape w/in your avatar.    Where are you located?     Looks wonderful...

  • 0 in reply to cb1_mobile
    Intellectual 840 points
    Hello,

    It is somehow weird that I have the option to mark my own post as being "solved".

    Thank you,
  • 0 in reply to cb1_mobile
    Intellectual 840 points
    Now, regarding the landscape.
    It is in Romania (Europe) Deva's stronghold.

    Thank you,
  • 0 in reply to Briceag Cosmin
    Guru 117855 points

    Briceag Cosmin said:
    It is somehow weird that I have the option to mark my own post as being "solved".

    So absolutely true - my friend!    Such proves a 'long-standing' forum WEAKNESS - which remains, 'uncorrected.'     Even weirder - the (fairly) recent decision to, 'Do AWAY WITH' - the always (motivating) 'LIKE!'

    Thank you for your kindness - and - when you've a moment - might you test my clients' (deliberately plural) report of, 'Success via (simple) resistor feedback  - between CAN_TX & CAN_RX?    That would be appreciated - and may serve (multiple) others here - as well.

    Yet - as I past advised - you must deploy (real) CAN-TRANSCEIVERS for 'Real World' applications - and you're urged to move in that direction - sooner rather than later.     (As a sailor - the solution 'offered up'  was of the, 'Any Port in a Storm' category - and (not all) ports prove friendly...